Instrument landing system

Japanese: 計器着陸装置 - けいきちゃくりくそうち
Instrument landing system
ILS is an abbreviation of instrument landing system. It is an aircraft landing guidance system that uses directional radio waves. It combines a localizer radio wave that indicates the direction facing the centerline of the runway, a glide path radio wave that indicates the correct descent path, and a marker beacon that indicates the starting point of descent and the position from the end of the runway. The localizer is installed at the end of the runway opposite the approach path and emits radio waves of 108 to 112 MHz, and the glide path is placed to the side of the runway touchdown point and emits radio waves of 328.6 to 335.4 MHz. If the aircraft receives this and correctly matches the indicators on the indicator instruments, it can approach on the correct path. The marker beacon emits 75 MHz radio waves upward, and when an aircraft passes overhead, the cockpit light turns on and a modulated sound is heard. As a rule, the inner marker is installed 1000 feet from the end of the runway, the middle marker is installed about 3500 feet, and the outer marker is installed 5 to 6 miles away. In preparation for the overcrowding of air transport worldwide, major airports are converting to microwave landing systems (MLS), which can set multiple approach courses with greater precision. →Ground-guided landing system →Related topics Airport | Automatic landing system

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:
instrument landing systemの訳,略してILS。指向性電波を利用した航空機の着陸誘導システム。滑走路の中心線に正対する方向を示すローカライザー電波,正しい降下経路を示すグライドパス電波,降下開始地点と滑走路端からの位置を示すマーカービーコンが組み合わされている。ローカライザーは滑走路の進入経路と反対側の端に設けられ,108〜112MHz,グライドパスは滑走路の接地点の側方に置かれ,328.6〜335.4MHzの電波を発射する。航空機はこれを受信して,指示計器の指標を正しく合致させれば,正規経路で進入できる。マーカービーコンは75MHz電波を上方に向けて発射しており,航空機が上空を通過すると操縦席のライトが点灯し,また変調音が聞こえるようになっている。原則として,滑走路端から1000フィートの位置にインナーマーカー,約3500フィートにミドルマーカー,5〜6マイルにアウターマーカーが設置される。世界的な航空輸送の過密化に備えて,主要空港ではより高精度で複数の進入コースを設定できるマイクロ波着陸装置(MLS)への転換が図られている。→地上誘導着陸装置
→関連項目空港|自動着陸装置

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